package com.aggron.util;

import com.aggron.exception.ParamException;
import com.baomidou.mybatisplus.toolkit.MapUtils;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import java.util.*;

/**
 * 校验bean的校验器
 * @author   liuhuan  on 2018/6/2.
 */
public class BeanValidator {
    /**
     * 全局的校验工厂
     */
    private static ValidatorFactory validatorFactory= Validation.buildDefaultValidatorFactory();

    public static <T> Map<String, String> validate(T t, Class... groups) {
        Validator validator=validatorFactory.getValidator();
        Set<ConstraintViolation<T>> validateResult=validator.validate(t,groups);
        if(validateResult.isEmpty()){
            return Collections.emptyMap();
        }else{
            LinkedHashMap errors=Maps.newLinkedHashMap();
            for(ConstraintViolation constraintViolation:validateResult){
                errors.put(constraintViolation.getPropertyPath().toString(),constraintViolation.getMessage());
            }
            return errors;
        }

    }

    public static Map<String, String> validateList(Collection<?> collection) {
        Preconditions.checkNotNull(collection);
        Iterator iterator = collection.iterator();
        Map errors;

        do {
            if (!iterator.hasNext()) {
                return Collections.emptyMap();
            }
            Object object = iterator.next();
            errors = validate(object, new Class[0]);
        } while (errors.isEmpty());

        return errors;
    }

    public static Map<String, String> validateObject(Object first, Object... objects) {
        if (objects != null && objects.length > 0) {
            return validateList(Lists.asList(first, objects));
        } else {
            return validate(first, new Class[0]);
        }
    }

    public static void check(Object param) throws ParamException {
        Map<String, String> map = BeanValidator.validateObject(param);
        if (MapUtils.isNotEmpty(map)) {
            throw new ParamException(map.toString());
        }
    }

}
